Conveners
Parallel Session B: part 1
- Tatsuya Chujo (University of Tsukuba (JP))
Parallel Session B: part 2
- Sungtae Cho
Parallel Session B: part 3
- Sandeep Chatterjee (IISER, Berhampur)
Parallel Session B: part 4
- Fuqiang Wang (Purdue University (US))
The real-time lattice simulation of the classical Yang-Mills (CYM) field is widely used to describe the non-equilibrium evolution of the highly-occupied and weakly coupled gluon matter, called glasma, in the early stage of the relativistic heavy-ion collision. When we study the glasma with the CYM simulation, we often assume no rapidity dependence, namely the boost invariance. This assumption...
The electron scattering process has been used to determine the nuclear charge radius. Similarly, the photon scattering process can be used to determine the nuclear strong-interaction radius, primarily through the diffractive photoproduction of vector mesons. Such an approach has been proven effective at RHIC. The isobar collisions of Ru+Ru and Zr+Zr at RHIC provided an excellent opportunity...
The Spin Hall Effect (SHE) is instrumental in investigating quantum effects in many-body systems. Recently,theoretical calculations indicate that the gradient of baryonic chemical potential (analogous to the electric field) can induce a sizable spin Hall current. At the RHIC Beam Energy Scan (BES) energies, the sign as well as the pattern of energy dependence of the difference in the second...
We perform a systematic study on the local and global spin polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons[1] in relativistic heavy-ion collisions at beam energy scan energies via the (3+1)-dimensional CLVisc hydrodynamics model[2] with a AMPT and SMASH initial conditions. Following the quantum kinetic theory, we decompose the polarization vector as the parts induced by thermal...
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element $\rho_{00}$ for vector mesons on a solid ground. Within the theory we formulate $\rho_{00}$ for $\phi$ mesons into a factorization form in separation of...
Hypernuclei are bound states of nucleons and hyperons. Precise measurements of hypernuclei properties and production yields can shed light on the poorly understood hyperon$-$nucleon (Y-N) interaction and production mechanisms of hypernuclei.
Thanks to the high statistics data and low collision energies, the STAR beam energy scan phase-II program provides a great opportunity to study...
We calculate the yields of molecular configuration hadrons produced by heavy ion collision using coalescence model. First, we calculated the transverse momentum distribution of deuteron using the coalescence model from proton transverse momentum distribution in Pb-Pb collisions at 2.76TeV measured by ALICE collaboration. From this, we estimate the parameters required for coalescence model at...
There is presently no consensus on how the $\phi$ meson mass and width will
change once it is put in a dense environment such as nuclear matter.
While many theoretical works exist, connecting them with experimental
measurements remains non-trivial task, as the $\phi$ meson in nuclear matter is
usually produced in relatively high-energy pA reactions, which are generally...
At sufficiently high temperatures and pressure, Quantum Chromodynamics predicts that ordinary nuclear matter undergoes a phase transition. This new state of matter is called Quark Gluon Plasma (QGP) and is characterized by deconfined quarks and gluons. In this context, high energy heavy ion collions have been historically used to recreate the QGP in the laboratory. In recent years, at the...
Previously, the ridge phenomenon in heavy-ion collisions such as PbPb has been well described by hydrodynamic models. However, the ridge structure of a small system, such as pp collisions, which could not offer enough conditions to create the medium required by hydrodynamic models, was observed in high-multiplicity events. This is why we focus on the Momentum Kick Model (MKM), which explains...
Using the string melting version of a multi-phase transport (AMPT) model without or with the sub-nucleon geometry for the proton to study multiparticle cumulants in p+p collisions at 13 TeV [1]. We have found that both versions of the model can produce c2{4}<0 for high-multiplicity events, which is thought to be the signal of the collective flow. The relation between c2{4} and the parton...
Hadronic resonances are effective tools for studying the hadronic phase in ultrarelativistic heavy-ion collisions. In fact, their lifetime is comparable to that of the hadronic phase, and resonances are sensitive to effects such as rescattering and regeneration processes, which might affect the resonance yields and shape of the transverse momentum spectra. These processes can be studied...
Despite being the overwhelming majority of events produced in hadron or heavy ion collisions, minimum bias events do not enjoy a robust first-principles theoretical description as their dynamics are dominated by low-energy quantum chromodynamics. I will present a novel expansion scheme of the cross section for minimum bias events that exploits an ergodic hypothesis for particles in the events,...
The global spin polarization of Lambda hyperon in heavy ion collisions has been well described by spin-vorticity coupling, serving as an evidence for creation of rapid spinning quark-gluon plasma. However the same picture fails to explain the measurement of local spin polarization. It has been realized recently that shear stress also couples to spin polarization, and phenomenologial studies...
A Large Ion Collider Experiment (ALICE) is an experiment at the Large Hadron Collider (LHC) which aims to understand the most basic properties of Quantum Chromodynamics (QCD) by observing Quark-Gluon Plasma (QGP) created at the center of relativistic heavy-ion collisions. The ALICE detector has been largely upgraded during the LHC Long Shutdown LS2 to become capable of collecting Pb-Pb...
The external-target experiment (CEE) is the first large-scale nuclear physics experimental device by China to operate in the fixed-target mode with an energy of ∼ 1 GeV. The purpose of the CEE is to study the properties of dense nuclear matter. CEE uses a multi-gap resistive plate chamber (MRPC) as its internal time-of-flight (iTOF) detector for the identification of final-state particles. An...
